SN75ALS176DR Equivalent & Substitute Parts

Part Overview

The SN75ALS176DR is a half-duplex RS422/RS485 transceiver manufactured by Texas Instruments in an 8-SOIC surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The device operates within a 4.75V to 5.25V supply voltage range and supports half-duplex communication protocols with a 60 mV receiver hysteresis specification.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN75ALS176DR
Manufacturer	Texas Instruments
Type	Transceiver
Protocol	RS422, RS485
Duplex Configuration	Half
Number of Drivers/Receivers	1/1
Receiver Hysteresis	60 mV
Voltage Supply Range	4.75V ~ 5.25V
Operating Temperature	0°C ~ 70°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the SN75ALS176DR is determined by the following critical parameters:

Primary Compatibility Criteria:

Protocol support: RS422 and RS485
Duplex mode: Half-duplex operation
Driver/Receiver configuration: 1/1
Package type: 8-SOIC surface mount
Supply voltage range: 4.75V ~ 5.25V minimum compatibility
Receiver hysteresis: 60 mV nominal specification

Substitution Categories:

Category 1: Texas Instruments Direct Equivalents (Active Status) Parts SN65ALS176DR, SN75ALS176ADR, and SN75ALS176BDR maintain identical electrical specifications and package configuration. These parts differ primarily in operating temperature range and product status, with SN65ALS176DR and SN75ALS176ADR offering extended temperature ranges and active product status.

Category 2: Manufacturer Alternatives (Active Status) Analog Devices ADM1485ARZ series and UMW ADM485ARZ provide functional equivalence with identical package and protocol support. These parts maintain the 4.75V ~ 5.25V supply range and half-duplex configuration. Receiver hysteresis specifications vary slightly (70 mV for Analog Devices, 70 mV for UMW).

Category 3: Extended Performance Alternatives Holt Integrated Circuits HI-4853PSHF and Renesas ISL3179 series offer enhanced specifications including extended temperature ranges and higher data rates, while maintaining core RS422/RS485 half-duplex functionality and 8-SOIC packaging.

Parameter Comparison

Part Number	Manufacturer	Protocol	Duplex	Drivers/Receivers	Package	Supply Voltage	Operating Temp	Receiver Hysteresis	Data Rate	Product Status
SN75ALS176DR	Texas Instruments	RS422, RS485	Half	1/1	8-SOIC	4.75V ~ 5.25V	0°C ~ 70°C	60 mV	—	Obsolete
SN65ALS176DR	Texas Instruments	RS422, RS485	Half	1/1	8-SOIC	4.75V ~ 5.25V	-40°C ~ 85°C	60 mV	35 Mbps	Active
SN75ALS176ADR	Texas Instruments	RS422, RS485	Half	1/1	8-SOIC	4.75V ~ 5.25V	0°C ~ 70°C	60 mV	—	Active
SN75ALS176BDR	Texas Instruments	RS422, RS485	Half	1/1	8-SOIC	4.75V ~ 5.25V	0°C ~ 70°C	60 mV	—	Active
ADM1485ARZ	Analog Devices Inc.	RS422, RS485	Half	1/1	8-SOIC	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	30 Mbps	Active
ADM1485ARZ-REEL	Analog Devices Inc.	RS422, RS485	Half	1/1	8-SOIC	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	30 Mbps	Active
ADM1485ARZ-REEL7	Analog Devices Inc.	RS422, RS485	Half	1/1	8-SOIC	4.75V ~ 5.25V	-40°C ~ 85°C	70 mV	30 Mbps	Active
ADM485ARZ	UMW	RS422, RS485	Half	1/1	8-SOIC	4.75V ~ 5.25V	0°C ~ 70°C	70 mV	2.5 Mbps	Active
HI-4853PSHF	Holt Integrated Circuits Inc.	RS422, RS485	Half	1/1	8-SOIC	3.15V ~ 5.5V	-55°C ~ 175°C	—	20 Mbps	Active
ISL3179EFBZ	Renesas Electronics Corporation	RS422, RS485	Half	1/1	8-SOIC	3V ~ 3.6V	-40°C ~ 125°C	28 mV	40 Mbps	Active
ISL3179EIBZ	Renesas Electronics Corporation	RS422, RS485	Half	1/1	8-SOIC	3V ~ 3.6V	-40°C ~ 125°C	28 mV	40 Mbps	Active

Engineering Selection Recommendations

Direct Replacement (Recommended for Obsolescence Mitigation): SN75ALS176ADR and SN75ALS176BDR are the preferred direct replacements, maintaining identical electrical specifications and operating temperature range while offering active product status. Both parts are manufactured by Texas Instruments and provide continuity with existing designs.

Extended Temperature Range Alternative: SN65ALS176DR provides extended operating temperature coverage (-40°C to 85°C) with identical core specifications and active product status. This part is suitable for applications requiring broader temperature performance while maintaining the original 60 mV receiver hysteresis.

Cross-Manufacturer Alternatives: ADM1485ARZ series (Analog Devices) and ADM485ARZ (UMW) maintain full protocol and package compatibility with minor variations in receiver hysteresis (70 mV). These parts are ROHS3 compliant and actively manufactured, supporting long-term supply chain stability.

Extended Performance Options: HI-4853PSHF (Holt Integrated Circuits) and ISL3179 series (Renesas) offer enhanced specifications including extended temperature ranges and higher data rates. These parts maintain 8-SOIC packaging and RS422/RS485 protocol support. Note that ISL3179 series operates at 3V to 3.6V supply voltage, requiring circuit redesign for 5V systems.

All recommended substitutes maintain ROHS3 compliance and EAR99 export classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can SN65ALS176DR directly replace SN75ALS176DR? A: Yes. SN65ALS176DR maintains identical electrical specifications including 60 mV receiver hysteresis, 4.75V to 5.25V supply voltage, and 8-SOIC packaging. The primary difference is extended operating temperature range (-40°C to 85°C versus 0°C to 70°C) and active product status.

Q: What is the difference between SN75ALS176ADR and SN75ALS176BDR? A: Both parts are parametric equivalents with identical specifications. The difference lies in manufacturing date codes and inventory availability. Both maintain the original operating temperature range and are actively manufactured by Texas Instruments.

Q: Are Analog Devices ADM1485ARZ variants interchangeable? A: ADM1485ARZ, ADM1485ARZ-REEL, and ADM1485ARZ-REEL7 are functionally identical. The suffix indicates packaging configuration (tube versus cut tape with reel). All three maintain identical electrical specifications and are suitable for direct substitution.

Q: Can ISL3179 series replace SN75ALS176DR in 5V systems? A: No. ISL3179 series operates at 3V to 3.6V supply voltage and is not compatible with 5V systems. Circuit redesign would be required to accommodate the lower supply voltage.

Q: What is the significance of receiver hysteresis differences? A: Receiver hysteresis affects noise immunity and switching threshold characteristics. The original part specifies 60 mV. Alternatives with 70 mV (Analog Devices, UMW) or 28 mV (Renesas) may require signal integrity analysis for noise-sensitive applications.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance consistent with the original SN75ALS176DR specification.

Q: What packaging options are available for substitute parts? A: All substitute parts are available in 8-SOIC surface mount package. Packaging configurations vary between tube and cut tape with reel options, but the physical package dimensions remain consistent at 0.154" width (3.90mm).

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